Effect of electron injection and transport materials on efficiency of deep-blue phosphorescent organic light-emitting devices

Eom, Sang-Hyun; Zheng, Ying; Wrzesniewski, Edward; Lee, Jaewon; Chopra, Neetu; So, Franky; Xue, Jiangeng

doi:10.1016/j.orgel.2009.03.002

Cited by 66 publications

(48 citation statements)

References 30 publications

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“…Furthermore, we have employed the dual-EML ͑D-EML͒ structure to maximize exciton generation and the p-i-n de-vice structure to minimize the device operating voltage, leading to P =36 lm/ W at peak for such deep-blue PHOLEDs. 12,13 Here, we report highly efficient white PHOLEDs by incorporating green and red phosphorescent dopants along with FIr6 into the D-EML p-i-n PHOLEDs.…”

Section: White Phosphorescent Organic Light-emitting Devices With Duamentioning

confidence: 97%

“…2,10 We have recently shown that the peak EQE of PHOLEDs based on FIr6 could be improved up to 20% by using 1,1-bis-͑di-4-tolylaminophenyl͒cyclohexane ͑TAPC͒ as the hole transporting layer ͑HTL͒ and tris͓3-͑3-pyridyl͒mesityl͔borane ͑3TPYMB͒ as the electron transporting layer ͑ETL͒. 11,12 The efficiency improvements are attributed to the enhanced charge and exciton confinement in the emissive layer ͑EML͒ provided by the charge transport layers. Furthermore, we have employed the dual-EML ͑D-EML͒ structure to maximize exciton generation and the p-i-n de-vice structure to minimize the device operating voltage, leading to P =36 lm/ W at peak for such deep-blue PHOLEDs.…”

Section: White Phosphorescent Organic Light-emitting Devices With Duamentioning

confidence: 99%

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White phosphorescent organic light-emitting devices with dual triple-doped emissive layers

Eom

Zheng

Wrzesniewski

et al. 2009

Applied Physics Letters

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We demonstrate high efficiency white organic light-emitting devices with two adjacent emissive layers each doped with three phosphorescent emitters (blue, green, and red). Efficient charge and exciton confinement is realized by employing charge transport layers with high triplet energy, leading to a maximum external quantum efficiency of (19±1)%. Using the p-i-n device structure, we have achieved a peak power efficiency of (40±2) lm/W and (36±2) lm/W at 100 cd/m2, a color rendering index of 79, and Commission Internationale de L’Eclairage coordinates of (0.37, 0.40) for the white light emission.

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Section: White Phosphorescent Organic Light-emitting Devices With Duamentioning

confidence: 97%

Section: White Phosphorescent Organic Light-emitting Devices With Duamentioning

confidence: 99%

White phosphorescent organic light-emitting devices with dual triple-doped emissive layers

Eom

Zheng

Wrzesniewski

et al. 2009

Applied Physics Letters

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“…31 12 In our single-emissive-layer the low solubility of OXD-7 may increase the device leakage current and reduce device efficiency; also the close triplet energy states of OXD-7 (2.57-2.7 eV) 37 and the emissive triplet ( 3 MLCT) energy states of the blue Ir complex (2.6 eV) may quench the emissive excitons and reduce the device efficiency.…”

Section: Table1mentioning

confidence: 98%

Cyclometalated Ir(III) Complexes for High-Efficiency Solution-Processable Blue PhOLEDs

et al. 2013

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThis article reports the systematic functionalization of FIrpic (1)

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“…bis-(1-naphthyl)-N,N -diphenyl1-1,1-biphenyl1-4,4 -diamine (NPB) as a hole transporting layer (HTL), 16 and tris(8-hydroxyquinolinato) aluminum (Alq 3 ) as the electron transport (ETL) and emitting layer (EML). 17 The respective transparent electrodes (ITO for bottom-emitting devices and the oxide/metal/oxide trilayer for top-emitting devices) were used as the anodes, whereas a Cs 2 CO 3 interlayer 18 and Al were used as the cathode. Phosphorescent devices consisted of a p-i-n structure with MeO-TPD doped with F 4 -TCNQ as the HIL, 1,1-bis-(di-4-tolylaminophenyl)cyclohexane (TAPS) 19 as the HTL, N,N -dicarbazolyl-3,5-benzene (mCP) 19 doped with 10 wt.…”

Section: Methodsmentioning

confidence: 99%

“…% fac tris(2-phenylpyridine) iridium (Ir(ppy) 3 ) green phosphorescent dopant as the EML, 20 4,7-diphenyl-1,10-phenanthroline (BPhen) as ETL and BPhen doped with CsCO 3 electron injection layer. 18 The same anode and cathode structures as the fluorescent device were also employed.…”

Section: Methodsmentioning

confidence: 99%

Transparent oxide/metal/oxide trilayer electrode for use in top-emitting organic light-emitting diodes

et al. 2011

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Abstract. The most commonly used transparent electrode, indium-tin oxide (ITO), is costly and requires methods of deposition that are highly destructive to organic materials when it is deposited on top of the organic layers in top-emitting organic light-emitting devices (OLEDs).Here we have employed a trilayer electrode structure consisting of a thin layer of metal sandwiched between two MoO 3 layers, which can be deposited through vacuum thermal evaporation without much damage to the organic active layers. Such MoO 3 /Au/MoO 3 trilayer electrodes have a maximum transmittance of nearly 90% at 600 nm and a sheet resistance of <10 ohms per square ( /sq) with a 10-nm thick Au intermediate layer. Using these trilayers as the top transparent anode, we have fabricated top-emitting OLEDs based on either a fluorescent or phosphorescent emitter, and observed nearly identical emission spectra and similar external quantum efficiencies as compared to the more conventional bottom-emitting OLEDs based on the commercial ITO anode. The power efficiency of the top-emitting devices is 20% to 30% lower than the bottom-emitting devices due to the somewhat inferior charge injection in the topemitting devices. The performance and emission characteristics of these devices indicate that this trilayer structure is a promising candidate as a transparent anode in top-emitting OLEDs.

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Effect of electron injection and transport materials on efficiency of deep-blue phosphorescent organic light-emitting devices

Cited by 66 publications

References 30 publications

White phosphorescent organic light-emitting devices with dual triple-doped emissive layers

White phosphorescent organic light-emitting devices with dual triple-doped emissive layers

Cyclometalated Ir(III) Complexes for High-Efficiency Solution-Processable Blue PhOLEDs

Transparent oxide/metal/oxide trilayer electrode for use in top-emitting organic light-emitting diodes

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